[quote CuriousPanda]@Itreallytiedtheroomtogether
And on your later point - why is any of this anti-trans? Where is your discussion on how this effects women and girls - we exist too and have equal rights to trans people.
How does recognizing trans women as women infringe on non-trans women's rights?[/quote]
Females have rights/protections separate to males for these reasons:
Because males statistically pose a physical and/or sexual risk to females. Statistically means not all males, or even the majority of males, but enough that the prevalence of offending in the male population is significantly higher than the female.
Because the interaction between a society structured around families self-supporting through private earnings and the more demanding role of the female in reproduction and breast-feeding puts mothers at an economic disadvantage, and in a capitalist society that translates as a lack of power relative to males.
Because a history of gendered roles based on sex puts female people under social pressure to take on more of the unpaid domestic and caring labour than males, again putting female people at an economic and social disadvantage.
Because social norms that have evolved due to the above result in unconscious bias about the abilities and aptitudes of females vs males that create unfair disadvantages to female people in domestic, work, cultural, political and social arenas beyond the core causes above.
Historically these protections and rights were called "Women's rights" , but that's only because Woman and Female were synonymous. They were just as much Female rights.
Trans women undoubtedly also suffer challenges and disadvantages, but unless you can show that statistically trans womens behaviour and outcomes are the same as female people rather than male in the specific areas listed above, it disadvantages female people to take away their single-sex rights and protections and give them to male women who don't have the same disadvantages.
That absolutely does not mean that we should not do anything to help and support trans women with their own needs and challenges, it just means that redefining all the existing single-sex support wholesale to be mixed-sex without considering whether it actually meets its intended purpose any more is not the right way to do it, for female people or for trans women.
So even if society changes the definition of Women from a sex to a gender, including trans women and excluding trans men, it is not a de facto reason to include Trans Women in these pre-existing rights - rather, it's a reason to rename them as Female rights to better reflect their purpose given the redefinition of the name Woman, and separate to that, consider what rights and protections this new, gender-based group of Woman may need.